O estudo do efeito da urbanização e da ocupação urbana no escoamento da microbacia do córrego Mogi em Uberlândia - MG

Abstract

The present study evaluated effects of the urbanization of a micro-basin and examined the quality of runoff water flowing into the Mogi stream in Uberlândia, MG. Samples of water were drawn during rainfall as well as the dry season. These samples were collected in the streams of water leading to the stream in areas of the land reserve as well as at various locations along the Mogi and Lagoinha stream. The data collected included: pH, temperature, bio-chemical oxygen demands (BOD), dissolved oxygen (DO), total suspended solids (TSS), turbidity, copper, iron and zinc. The runoff of the occupied area, when compared with the drainage of the area in process of occupation demonstrated the negative effects of urban occupancy. Samples collected from the Mogi and Lagoinha stream show reduced levels of residues during the analyzed rains and it is in conformity as the patterns of qualities specified in the class 3 of the Resolution 357/05 of the CONAMA (Conselho Nacional do Meio Ambiente) index. The samples could not be considered to be of class 2 due to the results only slightly superior in terms of BOD, copper and iron, than found in the soils of the micro-basin. The passage of runoff water through the local vegetation of the ciliary s forest improved the quality of the water sensibly.